Hi Jaegeuk,
On Tue, Mar 17, 2015 at 10:21:27AM -0700, Jaegeuk Kim wrote:
>> - err = page_symlink(inode, symname, symlen);
>> +
>> + if (symlen > MAX_FAST_SYMLINK_SIZE) {
>> + /* slow symlink */
>> + inode->i_op = &f2fs_symlink_inode_operations;
>> + inode->i_mapping->a_ops = &f2fs_dblock_aops;
>> + err = page_symlink(inode, symname, symlen);
>> + } else {
>> + /* fast symlink */
>> + struct page *node_page;
>> +
>> + inode->i_op = &f2fs_fast_symlink_inode_operations;
>> + node_page = get_node_page(sbi, inode->i_ino);
>> + memcpy((char *)&F2FS_INODE(node_page)->i_addr, symname, symlen);
>
>This is mostly likewise the inline_data flow.
>As of now, I can't recommend using any i_addr region, since we need to handle
>many cases such as truncation, roll-forward recovery, and fsck/dump tools.
>
>It is more sensible to enable inline_data by default, isn't it?
Do you mean to replace the codes above by something like
f2fs_write_inline_data()?
Regards,
Wanpeng Li
>
>Thanks,
>
>> + set_page_dirty(node_page);
>> + f2fs_put_page(node_page, 1);
>> + inode->i_size = symlen-1;
>> + set_inode_flag(F2FS_I(inode), FI_FAST_SYMLINK);
>> + mark_inode_dirty(inode);
>> + }
>> alloc_nid_done(sbi, inode->i_ino);
>>
>> d_instantiate(dentry, inode);
>> @@ -743,6 +774,20 @@ const struct inode_operations f2fs_symlink_inode_operations = {
>> #endif
>> };
>>
>> +const struct inode_operations f2fs_fast_symlink_inode_operations = {
>> + .readlink = generic_readlink,
>> + .follow_link = f2fs_follow_link,
>> + .put_link = page_put_link,
>> + .getattr = f2fs_getattr,
>> + .setattr = f2fs_setattr,
>> +#ifdef CONFIG_F2FS_FS_XATTR
>> + .setxattr = generic_setxattr,
>> + .getxattr = generic_getxattr,
>> + .listxattr = f2fs_listxattr,
>> + .removexattr = generic_removexattr,
>> +#endif
>> +};
>> +
>> const struct inode_operations f2fs_special_inode_operations = {
>> .getattr = f2fs_getattr,
>> .setattr = f2fs_setattr,
>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>> index 35a9117..efe28a2b 100644
>> --- a/fs/f2fs/node.c
>> +++ b/fs/f2fs/node.c
>> @@ -908,8 +908,9 @@ void remove_inode_page(struct inode *inode)
>> }
>>
>> /* remove potential inline_data blocks */
>> - if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
>> - S_ISLNK(inode->i_mode))
>> + if ((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
>> + S_ISLNK(inode->i_mode)) &&
>> + !f2fs_inode_is_fast_symlink(inode))
>> truncate_data_blocks_range(&dn, 1);
>>
>> /* 0 is possible, after f2fs_new_inode() has failed */
>> diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
>> index 502f28c..834880c 100644
>> --- a/include/linux/f2fs_fs.h
>> +++ b/include/linux/f2fs_fs.h
>> @@ -178,9 +178,11 @@ struct f2fs_extent {
>> #define F2FS_INLINE_DATA 0x02 /* file inline data flag */
>> #define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */
>> #define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */
>> +#define F2FS_FAST_SYMLINK 0x10 /* file fast symlink flag */
>>
>> #define MAX_INLINE_DATA (sizeof(__le32) * (DEF_ADDRS_PER_INODE - \
>> F2FS_INLINE_XATTR_ADDRS - 1))
>> +#define MAX_FAST_SYMLINK_SIZE (MAX_INLINE_DATA + 1)
>>
>> struct f2fs_inode {
>> __le16 i_mode; /* file mode */
>> --
>> 1.9.1
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